US20100108056A1 - Solar energy collecting module - Google Patents

Solar energy collecting module Download PDF

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Publication number
US20100108056A1
US20100108056A1 US12400587 US40058709A US2010108056A1 US 20100108056 A1 US20100108056 A1 US 20100108056A1 US 12400587 US12400587 US 12400587 US 40058709 A US40058709 A US 40058709A US 2010108056 A1 US2010108056 A1 US 2010108056A1
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surface
energy collecting
solar energy
collecting module
solar
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US12400587
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US9960296B2 (en )
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Hui-Hsiung Lin
Chia-Wei Yu
Yu-Nan Pao
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Industrial Technology Research Institute
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Industrial Technology Research Institute
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0236Special surface textures
    • H01L31/02366Special surface textures of the substrate or of a layer on the substrate, e.g. textured ITO/glass substrate or superstrate, textured polymer layer on glass substrate
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L31/00Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04Semiconductor devices sensitive to infra-red radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus peculiar to the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/054Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/12Light guides
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/52PV systems with concentrators

Abstract

A solar energy collecting system includes a substrate and at least one solar chip. The substrate includes a first surface, a second surface and a plurality of lateral surfaces, wherein the first surface faces the second surface, the lateral surfaces are adjacent to the first and second surfaces, and a first micro structure is formed on the first or the second surface. The solar chip is near one of the lateral surfaces. Solar light penetrates the first and the second surface and is refracted or reflected by the first micro structure to leave the substrate via the lateral surface and be absorbed by the solar chip.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This Application claims priority of Taiwan Patent Application No. 97142819, filed on November 6, 2008, the entirety of which is incorporated by reference herein.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The invention relates to a solar energy collecting module, and in particular relates to a solar energy collecting module with a micro structure refracting or reflecting solar light to a specific position for concentration.
  • 2. Description of the Related Art
  • Due to rising petroleum prices and decreasing raw material supplies, new energy sources have been developed. Of which, solar energy has become a popular choice.
  • U.S. Pat. No. 7,190,531 discloses a solar energy collecting system utilizing a Fresnel lens to gather the solar light to a solar chip. Such a solar energy collecting system is often equipped with a solar tracking system that directs the solar chip to always face the sun, thereby increasing solar energy collection efficiency. However, such a system is very heavy and has limited applications.
  • U.S. Pat. No. 6,971,756 discloses a radiation energy collecting and transferring device utilizing mirrors to collect solar light. When the solar light reaches the mirrors, it is reflected to the solar chip. The mirrors change inclined angles to track the sun. Such a system, however, still requires a solar tracking system, which makes the system very heavy.
  • U.S. Pat. No. 6,619,282 discloses a solar energy collecting system utilizing water to conduct solar light and constrain the angle of the solar light. The solar light is conducted to the lateral side of the device. Although such a device occupies a smaller volume, water is needed.
  • BRIEF SUMMARY OF INVENTION
  • An embodiment of a solar energy collecting system of the invention comprises a substrate and at least one solar chip. The substrate comprises a first surface, a second surface and a plurality of lateral surfaces, wherein the first surface faces the second surface, the lateral surfaces are adjacent to the first and second surfaces, and a first micro structure is formed on the first or the second surface. The solar chip is near one of the lateral surfaces. Solar light penetrates the first and the second surface and is refracted or reflected by the first micro structure to leave the substrate via the lateral surface and be absorbed by the solar chip.
  • The first micro structure comprises a plurality of strips parallel to one of the lateral surfaces, and the cross section of the strip is triangular.
  • The first micro structure comprises protrusions of a pyramid or cylinder shape.
  • The solar chip is made of silicon or the chemical elements listed on the III or V column of the periodic table.
  • The first surface is coated by a water repellent material comprising polyvinylidene fluoride, polysulfone, reactive modifying agent with a water-free polymer, silicon rubber, Acrylonitrile-Butadien-Styrene, or PTFE.
  • The first surface has a micro/nano-scale structure comprising a micro/nano layer formed on the substrate. The micro/nano-scale structure comprises a plurality three-dimensional structures with a cross section having a width that is gradually large from a top to bottom portion, wherein the three dimensional structure has a period of 100˜600 nm and a height of 100˜570 nm.
  • A detailed description is given in the following embodiments with reference to the accompanying drawings.
  • BRIEF DESCRIPTION OF DRAWINGS
  • The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
  • FIG. 1 is a schematic view of a solar energy collecting module of the invention;
  • FIG. 2 is a schematic view showing a substrate of the solar energy collecting module of the invention;
  • FIG. 3A depicts the solar energy collecting efficiency of the solar chip versus a variety of the angles A and B when the angle A is equal to angle B;
  • FIG. 3B is an enlarged view of the substrate of FIG. 2;
  • FIG. 4 depicts the solar energy collecting efficiency of the solar chip versus a variety of angle B when the angle A=80°;
  • FIG. 5 is a schematic view of the micro/nano structure formed on the first surface of the substrate; and
  • FIG. 6 depicts the solar energy collecting efficiency of the solar chip versus a variety of angle Bs when the angle A=80° and the micro structure is formed on the first surface.
  • DETAILED DESCRIPTION OF INVENTION
  • Referring to FIG. 1, a solar energy collecting system 100 comprises a substrate 10 and at least one solar chip 20. FIG. 2 depicts the substrate 10. The substrate 10 comprises a first surface 12, a second surface 14 and four lateral surfaces 16. The first surface 12 faces the second surface 14. The lateral surfaces 16 are adjacent to the first surface 12 and the second surface 14. The solar chip 20 is near one of the four lateral surface 16, as shown in FIG. 1.
  • The substrate 10 is made of a transparent material, whereby the solar light penetrates the first surface 12 and reaches the second surface 14, as shown in FIG. 2. A microstructure 18 is formed on the second surface 14. The solar light is reflected or refracted by the micro structure 18 to leave the substrate 10 and be absorbed by the solar chip 20. Although the micro structure 18 is formed on the second surface 14 in this embodiment, the micro structure 18 can be formed on the first surface 12.
  • To increase the amount of solar light entering the substrate 10, a micro/nano scale structure with anti-reflective function can be formed on the first surface. In addition, as the substrate 10 can be applied to the window glass, a micro/nano scale structure with water repellent property can be formed on the first surface 12 or a water repellent material can be coated on the first surface 12 to prevent rain drops from attaching to the window glass. The water repellent material can be polyvinylidene fluoride, polysulfone, reactive modifying agent with a water-free polymer, silicon rubber, Acrylonitrile-Butadien-Styrene, or PTFE.
  • The micro structure 18 on the second surface 14 comprises a plurality of strips, as shown in FIG. 2. The cross section of the strip is triangular. A part of the solar light can be reflected to leave the substrate 10 via the lateral surface 16 and enter the solar chip 20. In such a structure, the solar chip 20 is disposed near two opposite lateral surfaces 16 parallel to the strips. Similarly, when the micro structure 18 is formed on the first surface 12, the solar chips 20 can be disposed near two opposite lateral surfaces 16 parallel to the strips.
  • FIG. 3A depicts the solar energy collecting efficiency. The cross section of the strip of the micro structure 18 is triangular. The vertex angle of the triangular is divided into two angles A and B by a vertical line extending from an apex. In FIG. 3A, the solar energy collecting efficiency is measured when angle A is equal to angle B. The solar energy collecting efficiency is defined as the ratio of the solar light reflected by the micro structure 18 over the solar light entering the substrate 10. In this embodiment, the size of the substrate 10 is 240×180×3 mm. The size of the solar chip is 240×3 mm. The height of the strip is 25 μm. FIG. 3A shows the good efficiency when angle A and B are 80°. FIG. 3B is an enlarged view of the substrate of FIG. 2.
  • FIG. 4 shows the solar energy collecting efficiency of the solar chip versus a variety of angle B when the angle A=80°. The good efficiency occurs when the angle B is 40° or 70°.
  • In addition, the micro structure is not limited to the striped structure. It can be a protrusion of a pyramid. In such a structure, the solar light can be reflected to four lateral surfaces 16 uniformly. The solar chips 20 can be disposed near four lateral surfaces 16.
  • The micro structure 18 can also be formed on the first surface 12. When solar light reaches the first surface 12, it has a large refraction angle caused by the micro structure 18. When the refracted solar light reaches the second surface 14, total reflection occurs, which increases the solar energy collecting efficiency. When the micro structure is formed on the first surface 12, the micro/nano structure with anti-reflective or water repellent function is not needed. The water repellent material can be coated on the first surface 12 for preventing attachment of rain drops.
  • The micro structure formed on the first surface 12 can be the strips shown in FIG. 2. FIG. 6 depicts the solar energy colleting efficiency versus a variety of angle B when the micro structure is formed on the first surface 12 and the angle A=80°. In this embodiment, the size of the substrate 10 is 240×180×3 mm. The size of the solar chip is 240×3 mm. The height of the strip is 25 μm. FIG. 6 shows that when angle B is 20° or 30°, a good efficiency is obtained.
  • The solar light entering the substrate 10 is considered as 100%. If no collection is executed (a solar chip with an area equal to the substrate), the solar energy collecting efficiency per unit area is 100÷(240×180). In the embodiment of FIG. 6, when angle B=20°, the solar energy collecting efficiency is 8.81÷(240×3). The solar energy collecting efficiency of the invention is 5.28 times that as a no collection case. It indicates that the solar energy collecting module of the invention can conduct solar light into the solar chip near the lateral surface efficiently.
  • Although the micro structure is formed on the first surface 12 in FIG. 6, in this structure, no micro structure is formed on the second surface 14. The micro structure can be formed on both the first and second surfaces 12 and 14. When the solar light penetrates the first surface 12 and reaches the second surface 14, it is reflected or refracted by the micro structures on the first surface 12 and the second surface 14 to the lateral surface 16 and is absorbed by the solar chip 20.
  • As long as the solar light can be reflected or refracted efficiently, the shape of the micro structure is not limited. For example, pyramid or cylinder shape protrusions can be formed on the second surface 14. The positions of the solar chip can correspond to the shape of the micro structure. For example, in the embodiment, as the micro structure comprises strips, solar light can be conducted into the lateral surfaces parallel to the strips. The solar chip can be disposed near the two lateral surfaces. If the micro structure comprises cylinder protrusions, the collecting efficiency is substantially identical in all directions. The solar chips can be disposed near the four lateral surfaces for such a structure.
  • A micro/nano scale structure with anti-reflective or water repellent function is formed by a single-layer structure shown in FIG. 5. A micro/nano layer 15 is formed on the substrate 10. A metal layer 17 is formed on the micro/nano layer 15. The micro/nano layer 15 comprises a three dimensional structure 152 with a cross section having a width gradually large from a top to bottom portion. The period of the three dimensional structure 152 is 100˜600 nm (the period indicates the distance of the top of one of the three dimensional structures 152 to the top of the next three dimensional structure), and the height is 100˜750 nm. The material of the metal layer 17 can be gold, silver, aluminum, nickel, copper, chromium, tin oxide or ITO. The thickness is less than 150 nm.
  • The micro/nano layer 15 can be formed by the following method. The three dimensional mold is formed on the periphery of a roller by a lithography and etching process. A polymer substrate with high transparent property is provided. UV gel is coated on the surface of the polymer substrate. The polymer substrate is attached to the three dimensional mold and exposed to UV light, which hardens the UV gel. Finally the three dimensional structure 152 is formed. As many gaps exist between the three dimensional structure 152, the rain drops contact a smaller area to reduce adhesive force, which provides the water repellent function. A metal layer 17 is formed on the micro/nano layer 15 to allow the solar light to penetrate and reduce the reflection rate on the inner side, which provides an anti-reflective function. A hard coated protective layer is formed on the metal layer 17 (not shown in FIG. 5).
  • The single-layer structure of the invention has a wider viewing angle and lower costs when compared with the conventional multiple layer structure. The single-layer structure can be formed by a low temperature process and is suitable for plastic substrates. Additionally, the single-layered structure has no need for a vacant environment area and no need for pre-processing, and has high attachment properties and high anti-dirt properties.
  • Next, the solar energy collecting system of the invention is compared with a conventional backlight module of a side light type. The conventional backlight module conducts the light from a light source from the lateral side of a lightguide plate to the front surface of the lightguide plate. In addition to the lightguide plate, a reflective film, a diffusion film and a prism film are also needed. In the solar energy collecting system of the invention, light enters the substrate and is reflected by the micro structure to the solar chip on the later side. The reflective film, the diffusion film and the prism film are not needed.
  • While the invention has been described by way of example and in terms of the embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Claims (25)

  1. 1. A solar energy collecting module, comprising
    a substrate comprising a first surface, a second surface and a plurality of lateral surfaces, wherein the first surface faces the second surface, the lateral surfaces are adjacent to the first and second surfaces, and a first micro structures are formed on the second surface; and
    at least one solar chip near one of the lateral surfaces, wherein solar light penetrates the first surface and is refracted or reflected by the first micro structure on the second surface to leave the substrate via the lateral surface and be absorbed by the solar chip.
  2. 2. The solar energy collecting module as claimed in claim 1, wherein the substrate is transparent.
  3. 3. The solar energy collecting module as claimed in claim 1, wherein a second micro structure is formed on the lateral surfaces.
  4. 4. The solar energy collecting module as claimed in claim 1, wherein the first micro structure comprises a plurality of strips parallel to one of the lateral surfaces, and the cross section of the strip is triangular.
  5. 5. The solar energy collecting module as claimed in claim 4, wherein the solar chips are near the lateral side to which the strips are parallel.
  6. 6. The solar energy collecting module as claimed in claim 1, wherein the first micro structure comprises protrusions of a pyramid or cylinder shape.
  7. 7. The solar energy collecting module as claimed in claim 1, wherein the solar chip is made of silicon or the chemical elements listed on the III or V column of the periodic table.
  8. 8. The solar energy collecting module as claimed in claim 1, wherein the distance between the solar chips and the lateral surface is less than 1 mm.
  9. 9. The solar energy collecting module as claimed in claim 1, wherein the first surface is coated by a water repellent material comprising polyvinylidene fluoride, polysulfone, reactive modifying agent with a water-free polymer, silicon rubber, Acrylonitrile-Butadien-Styrene, or PTFE.
  10. 10. The solar energy collecting module as claimed in claim 1, wherein the first surface has a micro/nano-scale structure comprising a micro/nano layer formed on the substrate.
  11. 11. The solar energy collecting module as claimed in claim 10, wherein the micro/nano-scale structure comprises a plurality three-dimensional structures with a cross section having a width that is gradually large from a top to bottom portion, wherein the three dimensional structure has a period of 100˜600 nm and a height of 100˜570 nm.
  12. 12. The solar energy collecting module as claimed in claim 10, wherein the micro/nano-scale structure further comprises a metal layer formed on the micro/nano layer.
  13. 13. The solar energy collecting module as claimed in claim 12, wherein the metal layer comprises gold, silver, aluminum, nickel, copper, chromium, tin oxide or ITO.
  14. 14. The solar energy collecting module as claimed in claim 12, wherein the thickness of the metal layer is less than 150 nm.
  15. 15. The solar energy collecting module as claimed in claim 1, wherein the micro/nano structure further comprises a hard coating coated on the metal layer.
  16. 16. A solar energy collecting module, comprising:
    a substrate comprising a first surface, a second surface and a plurality of lateral surfaces, wherein the first surface faces the second surface, the lateral surfaces are adjacent to the first and second surfaces, and a first micro structures are formed on the first surface; and
    at least one solar chip near one of the lateral surfaces, wherein solar light penetrates the first surface and is refracted or reflected by the first micro structure on the second surface to leave the substrate via the lateral surface and be absorbed by the solar chip.
  17. 17. The solar energy collecting module as claimed in claim 16, wherein the substrate is transparent.
  18. 18. The solar energy collecting module as claimed in claim 16, wherein a second micro structure is formed on the lateral surfaces.
  19. 19. The solar energy collecting module as claimed in claim 16, wherein the first micro structure comprises a plurality of strips parallel to one of the lateral surfaces, and the cross section of the strip is triangular.
  20. 20. The solar energy collecting module as claimed in claim 19, wherein the solar chip is near the lateral side to which the strips are parallel.
  21. 21. The solar energy collecting module as claimed in claim 16, wherein the first micro structure comprises protrusions of a pyramid or cylinder shape.
  22. 22. The solar energy collecting module as claimed in claim 16, wherein the solar chip is made of silicon or the chemical elements listed on the III or V column of the periodic table.
  23. 23. The solar energy collecting module as claimed in claim 16, wherein the distance between the solar chips and the lateral surface is less than 1 mm.
  24. 24. The solar energy collecting module as claimed in claim 16, wherein the first surface is coated by a water repellent material comprising polyvinylidene fluoride, polysulfone, reactive modifying agent with a water-free polymer, silicon rubber, Acrylonitrile-Butadien-Styrene, or PTFE.
  25. 25. The solar energy collecting module as claimed in claim 16, wherein a third micro structure is formed on the second surface.
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TW97142819A TWI382551B (en) 2008-11-06 2008-11-06 Solar concentrating module
TWTW97142819 2008-11-06

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Cited By (2)

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US20100281721A1 (en) * 2009-05-06 2010-11-11 Industrial Technology Research Institute Multi-function solar-powered lighting system
US20130333742A1 (en) * 2012-06-15 2013-12-19 Chi Lin Technology Co., Ltd. Power generating window set and power generating module thereof

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